Error(s) in re-building vignettes:
--- re-building ‘duplicate.missing.cases.Rmd’ using rmarkdown
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'duplicate.missing.cases.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘duplicate.missing.cases.Rmd’

--- re-building ‘kernel.density.Rmd’ using rmarkdown
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'kernel.density.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘kernel.density.Rmd’

--- re-building ‘parallelization.Rmd’ using rmarkdown
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'parallelization.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘parallelization.Rmd’

--- re-building ‘roads.Rmd’ using rmarkdown
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'roads.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘roads.Rmd’

--- re-building ‘tiles.polygons.Rmd’ using rmarkdown
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'tiles.polygons.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘tiles.polygons.Rmd’

--- re-building ‘time.series.Rmd’ using rmarkdown
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'time.series.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘time.series.Rmd’

--- re-building ‘unstacking.bars.Rmd’ using rmarkdown
KernSmooth 2.23 loaded
Copyright M. P. Wand 1997-2009
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'unstacking.bars.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘unstacking.bars.Rmd’

SUMMARY: processing the following files failed:
  ‘duplicate.missing.cases.Rmd’ ‘kernel.density.Rmd’
  ‘parallelization.Rmd’ ‘roads.Rmd’ ‘tiles.polygons.Rmd’
  ‘time.series.Rmd’ ‘unstacking.bars.Rmd’

Error: Vignette re-building failed.
Execution halted